“Control the RPM speed from full to low speed manually according to your desire using the supplied voltage regulator.” – Gelid

“Kaze Q Fan Controller allows the independent regulation of 4 fans. The space-saving design allows installation of this unit in one 3.5″ bay. By using high quality brushed aluminum, this product has precious appearance.” – Scythe

“New Scythe Kaze Server Fan Controller allows the user to choose 3 method of controlling the fan speed, manual, semi-auto, and automatic control of up to four fans with a freely definable temperature. Reading out of these temperature is done by up to four temperature sensors. Only the highest...